package com.feilong.lib.digester3.xmlrules;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.StringTokenizer;

import org.xml.sax.Attributes;

import com.feilong.lib.digester3.binder.CallMethodBuilder;
import com.feilong.lib.digester3.binder.LinkedRuleBuilder;
import com.feilong.lib.digester3.binder.RulesBinder;

/**
 * 
 */
final class CallMethodRule extends AbstractXmlRule{

    public CallMethodRule(RulesBinder targetRulesBinder, PatternStack patternStack){
        super(targetRulesBinder, patternStack);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void bindRule(LinkedRuleBuilder linkedRuleBuilder,Attributes attributes) throws Exception{
        CallMethodBuilder builder = linkedRuleBuilder.callMethod(attributes.getValue("methodname"));

        // Select which element is to be the target. Default to zero,
        // ie the top object on the stack.
        int targetOffset = 0;
        String targetOffsetStr = attributes.getValue("targetoffset");
        if (targetOffsetStr != null){
            targetOffset = Integer.parseInt(targetOffsetStr);
            builder.withTargetOffset(targetOffset);
        }

        builder.useExactMatch("true".equalsIgnoreCase(attributes.getValue("useExactMatch")));

        String paramCountStr = attributes.getValue("paramcount");
        if (paramCountStr != null){
            int paramCount = Integer.parseInt(attributes.getValue("paramcount"));

            builder.withParamCount(paramCount);
        }

        String paramTypesStr = attributes.getValue("paramtypes");
        if (paramTypesStr != null && paramTypesStr.length() > 0){
            StringTokenizer tokens = new StringTokenizer(paramTypesStr, " \t\n\r,");
            String[] paramTypeNames = new String[tokens.countTokens()];
            int counter = 0;
            while (tokens.hasMoreTokens()){
                paramTypeNames[counter++] = tokens.nextToken();
            }
            builder.withParamTypes(paramTypeNames);
        }

        if ("true".equalsIgnoreCase(attributes.getValue("usingElementBodyAsArgument"))){
            builder.usingElementBodyAsArgument();
        }
    }

}
